Surgical linear cutter wishbone separation mechanism with detent

ABSTRACT

A surgical stapler includes a first half having a first elongate member and a surface with staple forming pockets. The stapler also includes a second half for releasably coupling with the first half and including a second elongate member having a distal portion for deploying staples. The elongate members are pivotable relative to each other about a pivot axis when the halves are releasably coupled. The stapler further includes a latching member for selectively clamping the halves in a clamped state. The stapler also includes a detent member extending laterally from one of the halves toward the other. The stapler further includes a shoulder member positioned on the other of the halves and configured to selectively engage the detent member in response to rotation of the first elongate member away from the second elongate member to an open state in which the elongate members assume a maximum angular orientation.

BACKGROUND

In some surgical operations, such as a gastrointestinal anastomosis, itmay be desirable to clamp down on one or more layers of tissue, cutthrough the clamped layers, and simultaneously drive staples through thelayers to substantially seal the severed layers of tissue together neartheir severed ends. One such instrument that may be used in suchoperations is a linear surgical stapler, also referred to as a “linearcutter.” A linear surgical stapler generally includes a first half(referred to as a “cartridge half” or “reload half”) having a distal jawconfigured to support a staple cartridge (or “reload”), and a secondhalf (referred to as an “anvil half”) having a distal jaw that supportsan anvil surface having staple forming features. The stapler furtherincludes a moveable clamp lever configured to releasably clamp thestapler halves together. The stapler halves are configured to pivotrelative to one another to receive and clamp tissue between the twodistal jaws when the clamp lever is closed. A firing assembly of thestapler is configured to be actuated to cut the clamped layers andsimultaneously drive staples through the tissue on either side of thecut line. After firing the stapler, the clamp lever may be opened, andthe stapler halves separated to release the severed and stapled tissue.

While various kinds of surgical stapling instruments and associatedcomponents have been made and used, it is believed that no one prior tothe inventor(s) has made or used the invention described in the appendedclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate embodiments of the invention,and, together with the general description of the invention given above,and the detailed description of the embodiments given below, serve toexplain the principles of the present invention.

FIG. 1 depicts a perspective view of an exemplary linear surgicalstapler, showing a cartridge half and an anvil half of the staplercoupled together with a clamp lever of the cartridge half in a fullyclosed position;

FIG. 2 depicts an exploded perspective view of the linear surgicalstapler of FIG. 1;

FIG. 3 depicts a perspective view of a proximal portion of the cartridgehalf of the linear surgical stapler of FIG. 1, showing a cartridgechannel in cross-section and the clamp lever in an open position toreveal internal features of the cartridge half,

FIG. 4 depicts a top perspective view of a firing assembly of the linearsurgical stapler of FIG. 1;

FIG. 5A depicts a side elevational view of the linear surgical staplerof FIG. 1, showing the stapler halves separated from one another;

FIG. 5B depicts a side elevational view of the linear surgical staplerof FIG. 1, showing proximal ends of the stapler halves coupled together;

FIG. 5C depicts a side elevational view of the linear surgical staplerof FIG. 1, showing a distal pin of the anvil half being received byclamp lever jaws of the cartridge half;

FIG. 5D depicts a side elevational view of the linear surgical staplerof FIG. 1, showing closure of the clamp lever to fully clamp the staplerhalves together;

FIG. 5E depicts a side elevational view of the linear surgical staplerof FIG. 1, showing distal actuation of the firing assembly while thestapler halves are in the fully clamped state;

FIG. 6 depicts a side elevational view of another exemplary linearsurgical stapler having an aperture positioned on the cartridge half anda corresponding detent positioned on the anvil half, showing the staplerhalves rotated relative to each other in an open state in which theproximal ends of the stapler halves are coupled together and the distalends of the stapler halves are spaced apart;

FIG. 6A depicts a side elevational view of a proximal end of the linearsurgical stapler of FIG. 6, showing the detent of the anvil halfinserted within the aperture of the cartridge half for coupling thestapler halves at their proximal ends during rotation of the staplerhalves between the open and clamped states;

FIG. 6B depicts a side elevational view of the proximal end of thelinear surgical stapler of FIG. 6, showing insertion of the detent ofthe anvil half into the aperture of the cartridge half during rotationalapproximation of the stapler halves;

FIG. 6C depicts a side elevational view of the proximal end of thelinear surgical stapler of FIG. 6, showing insertion of the detent ofthe anvil half into the aperture of the cartridge half during linearapproximation of the stapler halves;

FIG. 7A depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having a cartridge half with aproximally-facing multi-stage notch, showing distally-directed insertionof a proximal anvil pin into the notch;

FIG. 7B depicts a side elevational view of the proximal end of thelinear surgical stapler of FIG. 7A, showing upward translation of theproximal anvil pin within the notch;

FIG. 7C depicts a side elevational view of the proximal end of thelinear surgical stapler of FIG. 7A, showing rotation of the anvil halftoward the cartridge half for clamping the stapler halves together;

FIG. 8A depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having an anvil insert with archedgrooves and corresponding detents on the cartridge half, showinginsertion of the detents into the grooves during linear approximation ofthe stapler halves for coupling the stapler halves at their proximalends;

FIG. 8B depicts a cross sectional view of the proximal end of the linearsurgical stapler of FIG. 8A, taken along section line 8B-8B in FIG. 8A,showing linear approximation of the stapler halves;

FIG. 9 depicts a cross sectional view of a proximal end of anotherexemplary linear surgical stapler having corresponding stampedindentations on the stapler halves for coupling the stapler halves attheir proximal ends;

FIG. 10 depicts a cross sectional view of a proximal end of anotherexemplary linear surgical stapler having detents on the anvil half andcorresponding arched grooves on the cartridge half for coupling thestapler halves;

FIG. 11 depicts a cross sectional view of a proximal end of anotherexemplary linear surgical stapler having a metal leaf spring forcoupling the stapler halves at their proximal ends;

FIG. 12 depicts a cross sectional view of a proximal end of anotherexemplary linear surgical stapler having a plastic insert for couplingthe stapler halves at their proximal ends;

FIG. 13 depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having a cartridge half with a steppedanvil pin receiving notch and arched grooves, and having an anvil halfwith corresponding detents, showing insertion of the detents into thegrooves during linear approximation of the stapler halves for couplingthe stapler halves at their proximal ends;

FIG. 14A depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having corresponding proximal anvildetents and proximal cartridge indents, showing insertion of the detentsinto the indents during linear approximation of the stapler halves forcoupling the stapler halves at their proximal ends;

FIG. 14B depicts a cross sectional view of the proximal end of thelinear surgical stapler of FIG. 14A, taken along section line 14B-14B inFIG. 14A, showing insertion of the detents into the indents duringlinear approximation of the stapler halves for coupling the staplerhalves at their proximal ends;

FIG. 15A depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having a proximal anvil springbar andcorresponding proximal cartridge bores, showing insertion of thespringbar into the bores during linear approximation of the staplerhalves for coupling the stapler halves at their proximal ends;

FIG. 15B depicts a cross sectional view of the proximal end of thelinear surgical stapler of FIG. 15A, taken along section line 15B-15B inFIG. 15A, showing insertion of the springbar into the bores duringlinear approximation of the stapler halves for coupling the staplerhalves at their proximal ends;

FIG. 16 depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having an aperture positioned on thecartridge half and a corresponding detent positioned on the anvilshroud, showing insertion of the detent into the aperture during linearapproximation of the stapler halves for coupling the stapler halves attheir proximal ends;

FIG. 17A depicts a side elevational view of a proximal end of anotherexemplary linear surgical stapler having corresponding arched surfaceson the stapler shrouds for coupling the stapler halves and correspondingcamming separation features on the stapler shrouds for separating thestapler halves, showing linear approximation of the stapler halves;

FIG. 17B depicts a cross sectional view of the proximal end of thelinear surgical stapler of FIG. 17A, taken along section line 17B-17B inFIG. 17A, showing linear approximation of the stapler halves; and

FIG. 18 depicts a cross sectional view of a proximal end of anotherexemplary linear surgical stapler having corresponding mating surfaceson the stapler shrouds for coupling the stapler halves, showing linearapproximation of the stapler halves.

The drawings are not intended to be limiting in any way, and it iscontemplated that various embodiments of the invention may be carriedout in a variety of other ways, including those not necessarily depictedin the drawings. The accompanying drawings incorporated in and forming apart of the specification illustrate several aspects of the presentinvention, and together with the description serve to explain theprinciples of the invention; it being understood, however, that thisinvention is not limited to the precise arrangements shown.

DETAILED DESCRIPTION

The following description of certain examples of the invention shouldnot be used to limit the scope of the present invention. Other examples,features, aspects, embodiments, and advantages of the invention willbecome apparent to those skilled in the art from the followingdescription, which is by way of illustration, one of the best modescontemplated for carrying out the invention. As will be realized, theinvention is capable of other different and obvious aspects, all withoutdeparting from the invention. Accordingly, the drawings and descriptionsshould be regarded as illustrative in nature and not restrictive.

For clarity of disclosure, the terms “proximal” and “distal” are definedherein relative to a surgeon, or other operator, grasping a surgicalinstrument having a distal surgical end effector. The term “proximal”refers to the position of an element arranged closer to the surgeon, andthe term “distal” refers to the position of an element arranged closerto the surgical end effector of the surgical instrument and further awayfrom the surgeon. Moreover, to the extent that spatial terms such as“upper,” “lower,” “vertical,” “horizontal,” or the like are used hereinwith reference to the drawings, it will be appreciated that such termsare used for exemplary description purposes only and are not intended tobe limiting or absolute. In that regard, it will be understood thatsurgical instruments such as those disclosed herein may be used in avariety of orientations and positions not limited to those shown anddescribed herein.

As used herein, the terms “about” and “approximately” for any numericalvalues or ranges indicate a suitable dimensional tolerance that allowsthe part or collection of components to function for its intendedpurpose as described herein.

I. Exemplary Linear Surgical Stapler

A. Overview of Linear Surgical Stapler

FIGS. 1-2 show an exemplary linear surgical stapler (10) (also referredto as a “linear cutter”) suitable for use in a variety of cutting andstapling procedures, such as a gastrointestinal anastomosis procedure.Linear surgical stapler (10) includes a cartridge half (12) (alsoreferred to as a “reload half”) and an anvil half (14) configured toreleasably couple together to clamp tissue therebetween for simultaneouscutting and stapling of the clamped tissue.

Cartridge half (12) includes an elongate cartridge channel (16) having aproximal frame portion (18) and a distal jaw portion (20). Proximalframe portion (18) slidably retains a firing assembly (100) and includesa laterally opposed pair of upright side flanges (22). Each side flange(22) includes a vertical slot (24) arranged at a distal end thereof, anda tapered notch (26) arranged at a proximal end thereof. An outwardlyprojecting stiffening rib (28) extends longitudinally between the distalslot (24) and proximal notch (26) of each side flange (22) and isconfigured to provide the side flange (22) with enhanced stiffness. Anoutwardly flared upper segment (30) defines an upper edge of a proximalportion of each side flange (22) and is configured to facilitate receiptof anvil half (14) by cartridge half (12). Each side flange (22) furtherincludes an elongate firing slot (32) extending longitudinally betweenproximal notch (26) and distal slot (24) along a lower side of sideflange (22). Elongate firing slots (32) are configured to guide firingassembly (100) between proximal and distal positions. Firing assembly(100) is described in greater detail below in connection with FIG. 4.Distal jaw portion (20) of cartridge channel (16) is configured toreceive a staple cartridge (130) (or “reload”), which may be configuredin accordance with the teachings of U.S. patent application Ser. No.16/537,005, entitled “Linear Surgical Stapler,” filed on Aug. 9, 2019,the disclosure of which is incorporated by reference herein.

Cartridge half (12) further includes a clamp lever (40) (also referredto as a “latch lever”) pivotably coupled to cartridge channel (16) witha clamp lever pivot pin (42), which is arranged in approximate alignmentwith distal slots (24) of cartridge channel side flanges (22). Clamplever (40) includes an elongate lever arm (44) having a free proximalend (46) and a distal end that is pivotably coupled to a lower portionof cartridge channel (16) with pivot pin (42). A pair of opposed jaws(48) extend distally from the distal end of lever arm (44) alongsidecartridge channel side flanges (22). Each jaw (48) includes a curvedslot (50) having a closed proximal end and an open distal end configuredto receive a latch pin (68) of anvil half (14), as described below.

Clamp lever (40) is operable to pivot relative to cartridge channel (16)between an open position in which proximal end (46) of lever arm (44) isspaced from cartridge channel frame portion (18), and a closed positionin which proximal end (46) confronts cartridge channel frame portion(18). Actuation of clamp lever (40) from the open position to the closedposition operates to capture the opposed lateral ends of latch pin (68)within clamp lever jaw slots (50), and thereby clamp anvil half (14)against cartridge half (12), as shown and described below in connectionwith FIGS. 5C-5D. In that regard, the curvature of each jaw slot (50)defines respective upper and lower camming surfaces configured to engageand draw the respective lateral end of latch pin (68) toward cartridgechannel (16) as clamp lever (40) is pivotably closed. A resilient membershown in the form of a flat spring (52) biases lever arm (44) toward theopen position. Accordingly, flat spring (52) promotes disengagement ofclamp lever jaws (48) from anvil half latch pin (68) upon initialadvancement of clamp lever (40) from the closed position toward the openposition. As best shown in FIGS. 2 and 3, clamp lever (40) furtherincludes a latch member (54) arranged at proximal end (46) of lever arm(44). Clamp lever latch member (54) is configured to resiliently andreleasably engage a proximal end of cartridge channel frame portion (18)and thereby releasably retain clamp lever (40) in the closed position,for instance while stapler (10) is being fired.

Anvil half (14) of linear surgical stapler (10) includes an elongateanvil channel (60) having a proximal frame portion (62) and a distal jawportion (64). Proximal frame portion (62) includes a laterally opposedpair of upright side flanges (66) that are configured to be receivedbetween cartridge channel side flanges (22) when anvil half (14) iscoupled with cartridge half (12). A distal latch projection in the formof latch pin (68) extends laterally through the distal ends of anvilchannel side flanges (66), and a proximal pivot projection in the formof a proximal pin (70) extends laterally through the proximal ends ofanvil channel side flanges (66). Anvil pins (68, 70) are configured tofacilitate coupling of anvil half (14) with cartridge half (12), asdescribed below.

Distal jaw portion (64) of anvil half (14) supports an anvil plate (72)that defines an anvil surface having a plurality of staple formingpockets (not shown) configured to deform legs of staples ejected bystaple cartridge (130) when stapler (10) is fired, for example asdescribed in greater detail in U.S. patent application Ser. No.16/537,005, incorporated by reference above. In some versions, the anvilsurface may be formed integrally with distal jaw portion (64). Distaljaw portion (64) of anvil half (14) additionally supports a tapereddistal tip member (76). In some versions, distal tip member (76) may beselectively extendable relative to distal jaw portion (64) in accordancewith the teachings of U.S. patent application Ser. No. 16/165,587,entitled “Decoupling Mechanism for Linear Surgical Stapler,” filed onOct. 19, 2018, the disclosure of which is incorporated by referenceherein.

As shown in FIG. 2, linear surgical stapler (10) further includes aplurality of shrouds (56, 78) that cover select portions of stapler (10)and promote effective grip and manipulation of stapler (10) by anoperator during use. In the present example, a clamp lever shroud (56)is affixed to and covers an outwardly facing side of clamp lever (40)such that clamp lever shroud (56) is configured to pivot with clamplever (40) relative to cartridge channel (16). Additionally, an anvilshroud (78) is affixed to and covers an outwardly facing side of anvilchannel (60). In some versions, anvil shroud (78) may be coupled withanvil channel (60) in accordance with the teachings of U.S. patentapplication Ser. No. 16/102,170, entitled “Clamping Assembly for LinearSurgical Stapler,” filed on Aug. 13, 2018, the disclosure of which isincorporated by reference herein. It will be appreciated that in otherversions, shrouds (56, 78) may be coupled with clamp lever (40) andanvil channel (60) in a variety of other suitable manners readilyapparent to those of ordinary skill in the art.

As shown best in FIG. 3, a proximal end of cartridge half (12) includesa retaining assembly (80) configured to releasably retain portions ofanvil half (14) and firing assembly (100). Retaining assembly (80) ofthe present example includes an anvil latch member (82) and a detentmember (84), both of which are rotatably coupled with a proximal end ofcartridge channel (16) via a laterally extending pin (86) arrangedproximally of firing slots (32). A torsion spring (not shown) isconfigured to resiliently bias anvil latch member (82) and detent memberin opposite rotational directions about the lateral axis defined by pin(86).

Anvil latch member (82) includes an upper finger (88) configured toreleasably capture proximal anvil pin (70) when pin (70) is directedinto proximal tapered notches (26) of cartridge channel (16), therebycoupling the proximal ends of stapler halves (12, 14). A lower end ofanvil latch member (82) defines a release button (90) configured to bedepressed by the operator when clamp lever (40) is in the open positionto release proximal pin (70) from latch finger (88) and thereby permitseparation of the proximal ends of stapler halves (12, 14). Detentmember (84) includes a distal finger (88) configured to releasablycapture the proximal end of a slide block (102) of firing assembly (100)when firing assembly (100) is in a proximal home position, shown in FIG.3. Detent member (84) further includes a proximal hook (94) configuredto releasably capture an upper tip of clamp lever latch member (54)while slide block (102) is positioned distally of its proximal homeposition, thereby preventing actuation of clamp lever latch member (54)and opening of clamp lever (40) during firing of stapler (10). Whenfiring assembly (100) is in its proximal home position (i.e., before orafter firing of stapler (10)), proximal hook (94) of detent member (84)permits clamp lever latch member (54) to rotatably disengage proximalframe portion (18) of cartridge channel (16) in response to actuation bythe operator. As a result, clamp lever (40) may then be opened.Retaining assembly (80) and related components of cartridge half (12)may be further configured and operable in accordance with at least someof the teachings of U.S. patent application Ser. No. 16/102,164,entitled “Firing System for Linear Surgical Stapler,” filed on Aug. 13,2018, the disclosure of which is incorporated by reference herein.

As shown best in FIG. 4, firing assembly (100) of cartridge half (12)includes slide block (102), a pair of actuators (104, 106) (or “firingknobs”) pivotably coupled to slide block (102), and a plurality ofelongate beams (108, 112) extending distally from slide block (102). Apair of side beams (108) are coupled at their proximal ends to a distalend of slide block (102) and terminate distally in a pair of cam ramps(110). Cam ramps (110) are configured to engage the undersides of stapledrivers (not shown) housed within staple cartridge (130) and actuatestaple drivers upwardly to thereby drive (or “fire”) staples fromcartridge (130) into tissue clamped between staple cartridge (130) andanvil plate (72). A center beam (112) is coupled with side beams (108)via a bridge member (114) (or “knife block”) spaced distally from slideblock (102). Center beam (112) terminates distally in a distally angledknife member (116) having a distal cutting edge (118) configured to cuttissue clamped between the distal portions of stapler halves (12, 14). Adistal portion of center beam (112) additionally includes an upwardlyprojecting stop element (120) proximal to knife member (116), and adistally facing lockout projection (122) proximal to stop element (120).

Each actuator (104, 106) of firing assembly (100) is configured androtatable relative to slide block (102) between a deployed position anda retracted position such that only one actuator (104, 106) may bedeployed at a time, for example as described in greater detail in U.S.patent application Ser. No. 16/102,164, incorporated by reference above.In the deployed position, an actuator (104, 106) may be driven distallyby an operator to actuate firing assembly (100) distally through stapler(10) and thereby simultaneously cut and staple tissue clamped betweenstapler halves (12, 14).

B. Overview of Exemplary Staple Cartridge

As best shown in FIG. 2, staple cartridge (130) includes an elongatecartridge body (132) extending linearly along a longitudinal axisbetween a proximal end having a pair of hooks (134) and a distal endhaving a tapered nose (136). Proximal hooks (134) are configured toreleasably capture clamp lever pivot pin (42) and extend downwardlythrough corresponding openings formed in a floor of cartridge channel(16) when staple cartridge (130) is seated within distal jaw portion(20) of cartridge channel (16). A pair of wing tabs (138) disposed onthe lateral sides of cartridge body (132) near the proximal end areconfigured to facilitate insertion and removal of staple cartridge (130)relative to distal jaw portion (20). An upper side of cartridge body(132) defines a deck (140). An elongate knife slot (not shown) extendslongitudinally through deck (140) along the longitudinal axis of staplecartridge (130) and is configured to slidably receive knife member (116)of firing assembly (100) therethrough in response to distal actuationthereof, described above. A rigid tissue gap post (146) is secured at adistal end of the knife slot and protrudes upwardly away from cartridgedeck (140). A rounded upper end of tissue gap post (146) is configuredto contact a distal end of anvil plate (72) and thereby define a tissuegap between cartridge deck (140) and anvil plate (72) when staplerhalves (12, 14) are clamped together in the manner described below.Staple cartridge (130) may be configured in accordance with theteachings of U.S. patent application Ser. No. 16/537,005, incorporatedby reference above.

C. Exemplary Use of Linear Surgical Stapler

FIGS. 5A-5E show exemplary coupling of stapler halves (12, 14) andsubsequent firing of assembled stapler (10) during a surgical procedure.As shown in FIG. 5A, clamp lever (40) of cartridge half (12) is providedin the open position so that jaw slots (50) align with vertical slots(24) of cartridge channel side flanges (22). Additionally, firingassembly (100) is maintained in its proximal home position by detentmember (84) of retaining assembly (80), as shown in FIG. 3 describedabove. At this stage, a section of tissue (not shown) to be stapled andcut may be positioned over the top of staple cartridge (130) disposed indistal jaw portion (20) of cartridge half (12). Alternatively, thetissue may be positioned over staple cartridge (130) following couplingof the proximal ends of stapler halves (12, 14), described below.

As shown in FIG. 5A-5B, the proximal ends of stapler halves (12, 14) arealigned with one another and proximal anvil pin (70) is directeddownwardly into proximal tapered notches (26) of cartridge channel (16)to engage upper finger (88) of anvil latch member (82). This engagementforces anvil latch member (82) to resiliently rotate clockwise, thusenabling upper finger (88) of anvil latch member (82) to capture anvilpin (70) and thereby releasably couple together the proximal ends ofstapler halves (12, 14), as seen in FIG. 5B. As shown in FIG. 5C, andwith clamp lever (40) remaining in the open position, anvil half (14) isrotated toward cartridge half (12) about proximal anvil pin (70) so thatdistal latch pin (68) of anvil half (14) is received into vertical slots(24) of cartridge channel side flanges (22) and jaw slots (50) of clamplever (40). Distal jaw portions (20, 64) of stapler halves (12, 14) arenow in a partially approximated state such that tissue receivedtherebetween may be finally adjusted before clamping.

As shown in FIG. 5D, clamp lever (40) is closed to draw anvil latch pin(68) against the closed proximal ends of jaw slots (50) and therebyfully clamp anvil half (14) against cartridge half (12), with tissue(not shown) clamped between staple cartridge (130) and anvil plate (72).A slight transverse gap is defined between staple cartridge (130) andanvil plate (72) by tissue gap post (146) of staple cartridge (130),thus accommodating the tissue therebetween with a predetermined degreeof tissue compression. As shown in FIGS. 5A and 5B, tissue gap post(146) is disposed at a distal end of staple cartridge (130) and isconfigured to contact a distal end of anvil plate (72) when stapler (10)is in the fully clamped state shown in FIG. 5D, for example as describedin greater detail in U.S. patent application Ser. No. 16/537,005,incorporated by reference above.

As shown in FIG. 5E, upon reaching the fully clamped state, stapler (10)may be fired by driving a deployed actuator (104, 106) of firingassembly (100) distally along proximal frame portion (18) of cartridgehalf (12). As described above in connection with FIG. 4, this actioncauses elongate beams (108, 112) of firing assembly (100) to translatedistally through corresponding channels formed in staple cartridge (130)and thereby fire staples into the clamped tissue via cam ramps (110) andstaple drivers, and simultaneously cut the clamped tissue with knifemember (116). Following completion of the firing stroke, firing assembly(100) is returned to its proximal home position via the actuator (104,106). Clamp lever latch member (54) may then be depressed to release theproximal end of clamp lever (40) from cartridge channel (16), thuspermitting clamp lever (40) to be re-opened. Then, release button (90)of retaining assembly (80) may be depressed to release anvil half (14)from cartridge half (12) so that stapler halves (12, 14) may beseparated from one another, thereby releasing the newly stapled andsevered tissue. It will be understood that in some versions, stapler(10) may include features that promote decoupling of stapler halves (12,14) similar to those features disclosed in U.S. patent application Ser.No. 16/165,587, incorporated by reference above.

II. Exemplary Surgical Linear Cutter Wishbone Separation Mechanisms

As described above in connection with surgical stapler (10), a pivotablecoupling is established between the proximal ends of stapler halves (12,14) when anvil pin (70) is captured by upper finger (88) of anvil latchmember (82). Release button (90) of retaining assembly (80) may besubsequently depressed to release anvil half (14) from cartridge half(12) so that stapler halves (12, 14) may be separated from one another.

In some instances, it may be desirable to provide a linear surgicalstapler with an open state in which respective elongate members of thestapler halves assume a predetermined maximum angular orientationrelative to one another and remain releasably coupled together at theirproximal ends (also referred to as a “hang open” or “open aperture”state), such that the stapler in the open state can be easilymanipulated by an operator with a single hand. It may also be desirablefor the operator to be able to separate the halves by intuitivelypulling or prying the halves apart from each other without firstdepressing a retaining assembly release button. Such a configuration mayprotect against unintentional decoupling of the stapler halves duringsingle-handed manipulation of the stapler while also simplifying desiredseparations of the stapler halves. The following description providesseveral illustrative examples of variations of surgical stapler (10)that may provide such functionality.

A. Exemplary Linear Cutter Separation Mechanism with Detent andCorresponding Aperture

FIGS. 6-6C show an exemplary surgical stapler (210) including acartridge half (212) and an anvil half (214) configured to remainreleasably coupled together at their proximal ends in an open state inwhich respective elongate members of the stapler halves (212, 214)assume a predetermined maximum angular orientation relative to oneanother, and further configured to be pulled or pried apart from eachother to allow separation of stapler halves (212, 214) from each other.Stapler (210) is similar to stapler (10) described above except asotherwise described below.

Cartridge half (212) of linear surgical stapler (210) includes anelongate cartridge channel (216) having a proximal frame portion (218)and a distal jaw portion (220). Proximal frame portion (218) slidablyretains a firing assembly (not shown) and includes a laterally opposedpair of upright side flanges (222). Each side flange (222) includes avertical slot (224) arranged at a distal end thereof, and a notch (226)arranged at a proximal end thereof. In the example shown, each sideflange (222) extends upwardly to varying degrees along the length ofproximal frame portion (218), such that the proximal portion of eachside flange (222) defining the respective notch (226) is generallygoalpost-shaped. It will be appreciated that side flanges (222) may beconfigured in any other suitable manner. For example, one or both sideflanges (222) may extend upwardly in a more uniform manner along thelength of proximal frame portion (218) as shown in connection withstapler (10).

Cartridge half (212) further includes a clamp lever (240) pivotablycoupled to cartridge channel (216) with a clamp lever pivot pin (242),which is arranged in approximate alignment with distal slots (224) ofcartridge channel side flanges (222). Clamp lever (240) includes anelongate lever arm (244) having a free proximal end (246) and a distalend that is pivotably coupled to a lower portion of cartridge channel(216) with pivot pin (242). A pair of opposed jaws (248) extend distallyfrom the distal end of lever arm (244) alongside cartridge channel sideflanges (222). Each jaw (248) includes a curved slot (250) having aclosed proximal end and an open distal end configured to receive a latchpin (268) of anvil half (214), as described above in connection to FIGS.5A-5E.

Anvil half (214) of linear surgical stapler (210) includes an elongateanvil channel (260) having a proximal frame portion (262) and a distaljaw portion (264). Proximal frame portion (262) includes a laterallyopposed pair of upright side flanges (266) that are configured to bereceived between cartridge channel side flanges (222) when anvil half(214) is coupled with cartridge half (212). A distal latch projection inthe form of latch pin (268) extends laterally through the distal ends ofanvil channel side flanges (266), and a proximal pivot projection in theform of a round (e.g., circular) proximal pin (270) extends laterallythrough the proximal ends of anvil channel side flanges (266). Distaljaw portion (264) of anvil half (214) supports an anvil plate (272) thatdefines an anvil surface having a plurality of staple forming pockets(not shown) configured to deform legs of staples ejected by a staplecartridge (not shown) when stapler (210) is fired.

In one example, linear surgical stapler (210) may further include one ormore shrouds (e.g., a clamp lever shroud and/or an anvil shroud) thatcover select portions of stapler (210) and promote effective grip andmanipulation of stapler (210) by an operator during use.

As shown best in FIGS. 6A-6C, a proximal end of cartridge half (212)includes at least one window frame (280) defining an aperture (282)configured to releasably retain a portion of anvil half (214). Windowframe (280) of the present example is positioned on a side flange (222)of proximal frame portion (218) of cartridge channel (216) and, moreparticularly, extends distally from the goalpost-shaped proximal portionof side flange (222) defining the respective notch (226). In oneexample, window frame (280) may be integrally formed together with sideflange (222) as a unitary piece. For example, window frame (280) andside flange (222) may be stamped together on cartridge channel (216). Inthe example shown, aperture (282) has a generally rectangular shape withlongitudinally-extending upper and lower peripheral edges andvertically-extending proximal and distal peripheral edges. However, itwill be appreciated that aperture (282) may be provided with any othersuitable shape and may be only partially surrounded by peripheral edges(e.g., open-ended). For example, the lower and/or distal peripheraledges may be omitted, and/or the upper peripheral edge may be arched inthe longitudinal direction.

As shown, a proximal end of anvil half (214) includes at least onedetent member (284) configured to selectively engage window frame (280)for facilitating releasable coupling of stapler halves (212, 214).Detent member (284) of the present example is positioned on and extendslaterally outwardly from a side flange (266) of proximal frame portion(262) of anvil channel (260) such that detent member (284) is capable ofextending laterally into aperture (282). In one example, detent member(284) may be integrally formed together with side flange (266) as aunitary piece. For example, detent member (284) and side flange (266)may be stamped together on anvil channel (260).

As best shown in FIG. 6A, aperture (282) of window frame (280) isconfigured to releasably and movably capture detent member (284) whenproximal anvil pin (270) is received within proximal notches (226) withanvil half (214) oriented relative to cartridge half (212) aboutproximal anvil pin (270) within a predetermined angular range, therebycoupling the proximal ends of stapler halves (212, 214). Moreparticularly, aperture (282) is sized and configured to permit movementof detent member (284) therewithin to accommodate rotation of anvil half(214) about proximal anvil pin (270) through the predetermined angularrange.

In this regard, one or more peripheral edges of aperture (282) may beconfigured to selectively abut detent member (284) to at least partiallydefine one or more limits of the predetermined angular range. Forexample, an upper peripheral edge or shoulder of aperture (282) may beconfigured to selectively frictionally engage or abut detent member(284) in response to rotation of anvil half (214) away from cartridgehalf (212) to a predetermined maximum orientation to assist inpreventing inadvertent decoupling of stapler halves (212, 214), such asduring single-handed manipulation of stapler (210). In this manner, suchinteraction between detent member (284) and the upper peripheral edge ofaperture (282) may define an open state of stapler (210) by allowingcartridge half (212) and anvil half (214) to remain releasably coupledtogether at their proximal ends while their distal ends are spaced apartby an open gap. The remaining peripheral edges of aperture (282) may beconfigured to guide or otherwise permit movement of detent member (284)during rotation of anvil half (214) away from the upper peripheral edgeof aperture (282) toward cartridge half (212) about proximal anvil pin(270) and thereby allow stapler (210) to reach the clamped statedescribed above in connection to FIGS. 5A-5E. Thus, interaction betweendetent member (284) and aperture (282) may assist in reliably couplinganvil half (214) to cartridge half (212) during rotation of anvil half(214) about proximal anvil pin (270) between the open and clampedstates, as indicated by first arrow (A1) in FIG. 6A.

As best shown in FIGS. 6B and 6C, window frame (280) and detent member(284) are sized relative to each other (e.g., in the lateral direction)to permit selective overriding of the interaction between detent member(284) and the upper peripheral edge of aperture (282) upon applicationof a threshold separating (e.g., pulling or prying) force appliedbetween stapler halves (212, 214) to thereby withdraw detent member(284) from aperture (282) and separate stapler halves (212, 214) fromeach other. Likewise, window frame (280) and detent member (284) aresized relative to each other to permit selective overriding of anyinteraction between detent member (284) and an upper surface of windowframe (280) upon application of a threshold approximating force appliedbetween stapler halves (212, 214) to thereby insert detent member (284)into aperture (282) and couple stapler halves (212, 214) to each other.Such threshold forces may be applied rotationally about proximal anvilpin (270) (e.g., with a “scissors” motion), as indicated by second arrow(A2) in FIG. 6B, or may be applied linearly with stapler halves (212,214) parallel to each other, as indicated by third arrow (A3) in FIG.6C.

While a single window frame (280) and a single corresponding detentmember (284) are shown positioned on single cartridge and anvil sideflanges (222, 266), respectively, cartridge half (212) may include alaterally opposed pair of window frames (280) positioned on respectivecartridge side flanges (222) and anvil half (214) may likewise include alaterally opposed pair of detent members (284) positioned on respectiveanvil side flanges (266). Also, while the illustrated window frame (280)is positioned on cartridge half (212) and the illustrated detent member(284) is positioned on anvil half (214), it will be appreciated that aninverse arrangement may be used such that window frame (280) ispositioned on anvil half (214) and detent member (284) is positioned oncartridge half (212) (e.g., extending laterally inwardly from arespective side flange (222)).

During operation, the operator may initially couple stapler halves (212,214) together at their proximal ends by positioning proximal anvil pin(270) within notches (226) and by applying a threshold approximatingforce between stapler halves (212, 214) sufficient to override anyinteraction between detent member (284) and the upper surface of windowframe (280) to thereby insert detent member (284) into aperture (282),such as in either manner shown in FIG. 6B or 6C. The operator maysubsequently rotate anvil half (214) relative to cartridge half (212)about proximal anvil pin (270) as desired within the predeterminedangular range, such as between the open and clamped states as shown inFIG. 6A, while stapler halves (212, 214) remain reliably coupled to eachother to perform a cutting and/or stapling procedure. If desired, theoperator may selectively separate stapler halves (212, 214) from eachother by applying a threshold separating force between stapler halves(212, 214) sufficient to override the interaction between detent member(284) and the upper peripheral edge of aperture (282) to therebywithdrawn detent member (284) from aperture (282), such as in eithermanner shown in FIG. 6B or 6C.

B. Exemplary Linear Cutter Separation Mechanism with Proximally-FacingAnvil Pin Receiving Notch on Cartridge Half

In some instances, it may be desirable to provide a surgical staplerseparation mechanism which enables coupling and separation of thestapler halves to be performed from a rear (e.g., proximal) side of thestapler. FIGS. 7A-7C show another exemplary surgical stapler (310)including a cartridge half (312) and an anvil half (314) that areconfigured in such a manner, and which are similar in structure andfunction to stapler (210) described above except as otherwise describedbelow.

Cartridge half (312) includes an elongate cartridge channel (316) havinga proximal frame portion (318) including a laterally opposed pair ofupright side flanges (322), each including a notch (326) arranged at aproximal end thereof. Anvil half (314) includes an elongate anvilchannel (360) having a proximal frame portion (362) including alaterally opposed pair of upright side flanges (366) that are configuredto be received between cartridge channel side flanges (322) when anvilhalf (314) is coupled with cartridge half (312). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (370)extends laterally through the proximal ends of anvil channel sideflanges (366).

In the example shown, each notch (326) is multi-stage and generallyfaces proximally. More particularly, each notch (326) includes a firstnotch portion (326 a) extending distally from an open end positioned ona proximal surface of the respective side flange (322) to a second notchportion (326 b) extending vertically between upper and lower closedends, such that each notch (326) is generally L-shaped for facilitatingreleasable coupling of stapler halves (312, 314).

In this regard, each first notch portion (326 a) is configured toreceive proximal anvil pin (370) as anvil half (314) is translateddistally from a position proximal to cartridge half (312) with anvilhalf (314) oriented away from cartridge half (312), as indicated byfourth arrow (A4) in FIG. 7A, to thereby position proximal anvil pin(370) at or near the lower closed end of the respective second notchportion (326 b). Each second notch portion (326 b) is configured toreceive proximal anvil pin (370) as anvil half (314) is subsequentlytranslated upwardly with anvil half (314) oriented away from cartridgehalf (312), as indicated by fifth arrow (A5) in FIG. 7B, to therebyposition proximal anvil pin (370) at or near the upper closed end of thesecond notch portion (326 b). The upper closed end of each second notchportion (326 b) may be configured to position proximal anvil pin (370)at a predetermined location, whereat rotation of anvil half (314) towardcartridge half (312) about proximal anvil pin (370) permits the distallatch pin of anvil half (314) to be received into the vertical slots ofcartridge channel side flanges (322) and/or jaw slots of the clamp lever(not shown) for locking the distal latch pin, as indicated by sixtharrow (A6) in FIG. 7C, to thereby reliably couple anvil half (314) tocartridge half (312).

C. Exemplary Linear Cutter Separation Mechanism with Anvil Insert HavingArched Grooves and Corresponding Detents on Cartridge Half

In some instances, it may be desirable to provide a surgical staplerseparation mechanism which assists in guiding rotation of the staplerhalves relative to each other. FIGS. 8A-8B show another exemplarysurgical stapler (410) including a cartridge half (412) and an anvilhalf (414) that are configured in such a manner, and which are similarin structure and function to stapler (210) described above except asotherwise described below.

Cartridge half (412) includes an elongate cartridge channel (416) havinga proximal frame portion (418) including a laterally opposed pair ofupright side flanges (422), each including a notch (426) arranged at aproximal end thereof. Anvil half (414) includes an elongate anvilchannel (460) having a proximal frame portion (462) including alaterally opposed pair of upright side flanges (466) that are configuredto be received between cartridge channel side flanges (422) when anvilhalf (414) is coupled with cartridge half (412). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (470)extends laterally through the proximal ends of anvil channel sideflanges (466).

In the example shown, anvil half (414) further includes an anvil insert(480) extending downwardly from proximal anvil pin (470) between sideflanges (466) and including a laterally opposed pair of arched grooves(482), each revolving partially about proximal anvil pin (470) betweenclosed ends. Anvil insert (480) may be fixed against movement relativeto anvil channel (460) and may be constructed of a plastic material, forexample. Cartridge half (412) further includes a laterally opposed pairof detent members (484) extending laterally inwardly from side flanges(422) and vertically aligned with the respective notches (426).

Grooves (482) of anvil insert (480) are configured to releasably andmovably capture detent members (484) with a friction fit or aninterference fit when proximal anvil pin (470) is received withinproximal notches (426) with anvil half (414) oriented relative tocartridge half (412) about proximal anvil pin (470) within apredetermined angular range, thereby coupling the proximal ends ofstapler halves (412, 414). In this regard, the peripheral edges ofgrooves (482) may be configured to constrain movement of detent members(484) to a partial orbital path about proximal anvil pin (470), and toguide detent members (484) along such a path during rotation of anvilhalf (414) relative to cartridge half (412) about proximal anvil pin(470) between open and clamped states.

As best shown in FIG. 8B, grooves (482) and detent members (484) aresized relative to each other (e.g., in the lateral direction) to permitselective overriding of the interaction between detent members (484) andthe peripheral edges of grooves (482) upon application of a thresholdseparating force applied between stapler halves (412, 414) to therebywithdraw detent members (484) from grooves (482). Likewise, anvil insert(480) and detent members (484) are sized relative to each other topermit selective overriding of any interaction between detent members(484) and a lower surface of anvil insert (480) upon application of athreshold approximating force applied between stapler halves (412, 414)to thereby insert detent members (484) into grooves (482), as indicatedby seventh and eighth arrows (A7, A8) in FIG. 8A-8B, respectively.

D. Exemplary Linear Cutter Separation Mechanism with StampedIndentations on Anvil and Cartridge Halves

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that is integrally formed with the channelmembers of the stapler halves. FIG. 9 shows another exemplary surgicalstapler (510) including a cartridge half (512) and an anvil half (514)that are configured in such a manner, and which are similar in structureand function to stapler (210) described above except as otherwisedescribed below.

Cartridge half (512) includes an elongate cartridge channel (516) havinga proximal frame portion (518) including a laterally opposed pair ofupright side flanges (522). Anvil half (514) includes an elongate anvilchannel (560) having a proximal frame portion (562) including alaterally opposed pair of upright side flanges (566) that are configuredto be received between cartridge channel side flanges (522) when anvilhalf (514) is coupled with cartridge half (512).

In the example shown, anvil half (514) further includes a firstlaterally opposed pair of grooves (582 a) and a first laterally opposedpair of detent members (584 a) extending laterally outwardly from sideflanges (566). Likewise, cartridge half (512) includes a secondlaterally opposed pair of grooves (582 b) and a second laterally opposedpair of detent members (584 b) extending laterally inwardly from sideflanges (522). Grooves (582 a, 582 b) and/or detent members (584 a, 584b) may be arched in the longitudinal direction. In one example, grooves(582 a, 582 b) and/or detent members (584 a, 584 b) may be integrallyformed together with the respective side flange(s) (522, 566) as aunitary piece(s). For example, grooves (582 a), detent members (584 a),and side flanges (566) may be stamped together on anvil channel (560),and grooves (582 b), detent members (584 b), and side flanges (522) maybe stamped together on cartridge channel (516).

Grooves (582 a, 582 b) are configured to releasably and movably capturecorresponding detent members (584 a, 584 b) with a friction fit or aninterference fit when anvil half (514) is oriented relative to cartridgehalf (512) within a predetermined angular range, thereby coupling theproximal ends of stapler halves (512, 514). In this regard, theperipheral edges of grooves (582 a, 582 b) may be configured toconstrain movement of detent members (584 a, 584 b) to a predeterminedpath, and to guide detent members (584 a, 584 b) along such a pathduring rotation of anvil half (514) relative to cartridge half (512)between open and clamped states.

While not shown, cartridge half (512) may include notches (not shown)arranged at proximal ends of side flanges (522), and anvil half (514)may include a proximal pivot projection in the form of a round (e.g.,circular) proximal pin extending laterally through the proximal ends ofanvil channel side flanges (566) for selective receipt by such notches.

E. Exemplary Linear Cutter Separation Mechanism with Detents on AnvilHalf and Corresponding Arched Grooves on Cartridge Half

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that is integrally formed with the channelmembers of the stapler halves different from that described above inconnection to FIG. 9. FIG. 10 shows another exemplary surgical stapler(610) including a cartridge half (612) and an anvil half (614) that areconfigured in such a manner, and which are similar in structure andfunction to stapler (210) described above except as otherwise describedbelow.

Cartridge half (612) includes an elongate cartridge channel (616) havinga proximal frame portion (618) including a laterally opposed pair ofupright side flanges (622). Anvil half (614) includes an elongate anvilchannel (660) having a proximal frame portion (662) including alaterally opposed pair of upright side flanges (666) that are configuredto be received between cartridge channel side flanges (622) when anvilhalf (614) is coupled with cartridge half (612).

In the example shown, cartridge half (612) further includes a laterallyopposed pair of slots (682), and anvil half (614) includes a laterallyopposed pair of detent members (684) extending laterally outwardly fromside flanges (666). In one example, slots (682) may be arched in thelongitudinal direction. In addition or alternatively, detent members(684) may be integrally formed together with the respective side flanges(666) as a unitary piece. For example, detent members (684) and sideflanges (666) may be stamped together on anvil channel (660).

Slots (682) are configured to releasably and movably capturecorresponding detent members (684) with a friction fit or aninterference fit when anvil half (614) is oriented relative to cartridgehalf (612) within a predetermined angular range, thereby coupling theproximal ends of stapler halves (612, 614). In this regard, theperipheral edges of slots (682) may be configured to constrain movementof detent members (684) to a predetermined path, and to guide detentmembers (684) along such a path during rotation of anvil half (614)relative to cartridge half (612) between open and clamped states.

While not shown, cartridge half (612) may include notches (not shown)arranged at proximal ends of side flanges (622), and anvil half (614)may include a proximal pivot projection in the form of a round (e.g.,circular) proximal pin extending laterally through the proximal ends ofanvil channel side flanges (666) for selective receipt by such notches.

F. Exemplary Linear Cutter Separation Mechanism with Metal Leaf SpringInsert

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that is actuatable in the lateraldirection. FIG. 11 shows another exemplary surgical stapler (710)including a cartridge half (712) and an anvil half (714) that areconfigured in such a manner, and which are similar in structure andfunction to stapler (710) described above except as otherwise describedbelow.

Cartridge half (712) includes an elongate cartridge channel (716) havinga proximal frame portion (718) including a laterally opposed pair ofupright side flanges (722), each including a notch (726) arranged at aproximal end thereof. Anvil half (714) includes an elongate anvilchannel (760) having a proximal frame portion (762) including alaterally opposed pair of upright side flanges (766) that are configuredto be received between cartridge channel side flanges (722) when anvilhalf (714) is coupled with cartridge half (712). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (770)extends laterally through the proximal ends of anvil channel sideflanges (766).

In the example shown, anvil half (714) further includes an anvil insert(780) extending downwardly from proximal anvil pin (770) between sideflanges (766), and cartridge half (712) further includes a laterallyopposed pair of slots (782) vertically aligned with the respectivenotches (726). Anvil insert (780) may be constructed as a metal leafspring, and includes a laterally opposed pair of spring arms (784)biased laterally outwardly from side flanges (766) to be releasablycaptured by slots (782) when proximal anvil pin (770) is received withinproximal notches (726), thereby coupling the proximal ends of staplerhalves (712, 714). Anvil insert (780) may be rotatable together withanvil channel (760) relative to cartridge channel (716) about proximalanvil pin (770), or alternatively may be rotatable together withcartridge channel (716) relative to anvil channel (760) about proximalanvil pin (770). In cases with the former configuration, slots (782) maybe arched in the longitudinal direction to constrain movement of springarms (784) to a partial orbital path about proximal anvil pin (770), andto guide spring arms (784) along such a path during rotation of anvilhalf (714) relative to cartridge half (712) about proximal anvil pin(770) between open and clamped states. In cases with the latterconfiguration, slots (782) may be sized to inhibit movement of springarms (784) in the longitudinal direction.

As shown, slots (782) and spring arms (784) are sized relative to eachother (e.g., in the lateral direction) to permit selective overriding ofthe interaction between spring arms (784) and the peripheral edges ofslots (782) upon application of a threshold laterally-inward forceapplied to spring arms (784) to thereby withdraw spring arms (784) fromslots (782). In one example, springs arms (784) may include cammingsurfaces configured to interact with upper surfaces of cartridge sideflanges (722) to urge spring arms (784) laterally inwardly duringcoupling of stapler halves (712, 714).

G. Exemplary Linear Cutter Separation Mechanism with Molded PlasticInsert

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that is actuatable in the lateraldirection different from that described above in connection to FIG. 11.FIG. 12 shows another exemplary surgical stapler (810) including acartridge half (812) and an anvil half (814) that are configured in sucha manner, and which are similar in structure and function to stapler(810) described above except as otherwise described below.

Cartridge half (812) includes an elongate cartridge channel (816) havinga proximal frame portion (818) including a laterally opposed pair ofupright side flanges (822), each including a notch (826) arranged at aproximal end thereof. Anvil half (814) includes an elongate anvilchannel (860) having a proximal frame portion (862) including alaterally opposed pair of upright side flanges (866) that are configuredto be received between cartridge channel side flanges (822) when anvilhalf (814) is coupled with cartridge half (812). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (870)extends laterally through the proximal ends of anvil channel sideflanges (866).

In the example shown, anvil half (814) further includes an anvil insert(880) extending downwardly from proximal anvil pin (870) between sideflanges (866), and cartridge half (812) further includes a laterallyopposed pair of slots (882) vertically aligned with the respectivenotches (826). Anvil insert (880) may be constructed of a plasticmaterial, and includes a laterally opposed pair of resilient arms (884)biased laterally outwardly from side flanges (866) to be releasablycaptured by slots (882) when proximal anvil pin (870) is received withinproximal notches (826), thereby coupling the proximal ends of staplerhalves (812, 814). Anvil insert (880) may be rotatable together withanvil channel (860) relative to cartridge channel (816) about proximalanvil pin (870), or alternatively may be rotatable together withcartridge channel (816) relative to anvil channel (860) about proximalanvil pin (870). In cases with the former configuration, slots (882) maybe arched in the longitudinal direction to constrain movement ofresilient arms (884) to a partial orbital path about proximal anvil pin(870), and to guide resilient arms (884) along such a path duringrotation of anvil half (814) relative to cartridge half (812) aboutproximal anvil pin (870) between open and clamped states. In cases withthe latter configuration, slots (882) may be sized to inhibit movementof resilient arms (884) in the longitudinal direction.

As shown, slots (882) and resilient arms (884) are sized relative toeach other (e.g., in the lateral direction) to permit selectiveoverriding of the interaction between resilient arms (884) and theperipheral edges of slots (882) upon application of a thresholdlaterally-inward force applied to resilient arms (884) to therebywithdraw resilient arms (884) from slots (882). In one example,resilient arms (884) may include camming surfaces configured to interactwith upper surfaces of cartridge side flanges (822) to urge resilientarms (884) laterally inwardly during coupling of stapler halves (812,814).

H. Exemplary Linear Cutter Separation Mechanism with Stepped Anvil PinReceiving Notch on Cartridge Half

In some instances, it may be desirable to provide a surgical staplerseparation mechanism which assists in guiding rotation of the staplerhalves relative to each other. FIG. 13 shows another exemplary surgicalstapler (910) including a cartridge half (912) and an anvil half (914)that are configured in such a manner, and which are similar in structureand function to stapler (210) described above except as otherwisedescribed below.

Cartridge half (912) includes an elongate cartridge channel (916) havinga proximal frame portion (918) including a laterally opposed pair ofupright side flanges (922), each including a notch (926) arranged at aproximal end thereof. Anvil half (914) includes an elongate anvilchannel (960) having a proximal frame portion (962) including alaterally opposed pair of upright side flanges (966) that are configuredto be received between cartridge channel side flanges (922) when anvilhalf (914) is coupled with cartridge half (912). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (970)extends laterally through the proximal ends of anvil channel sideflanges (966).

In the example shown, each notch (926) is stepped. More particularly,each notch (926) includes a first notch portion (926 a) extendingdownwardly from an open end positioned on an upper surface of therespective side flange (922) to a second notch portion (926 b)longitudinally offset from first notch portion (926 a) and extendingdownwardly to a closed end for facilitating releasable coupling ofstapler halves (912, 914). Also in the example shown, cartridge half(912) further includes at least one arched groove (982) revolvingpartially about the closed end of second notch portion (926 b) betweenclosed ends. Anvil half (914) further includes a laterally opposed pairof detent members (984) extending laterally outwardly from side flanges(966).

Groove (982) is configured to releasably and movably capture detentmember (984) with a snap fit when proximal anvil pin (970) is positionedat the closed end of second notch portion (926 b) with anvil half (914)oriented relative to cartridge half (912) about proximal anvil pin (970)within a predetermined angular range, thereby coupling the proximal endsof stapler halves (912, 914). In this regard, the peripheral edges ofgroove (982) may be configured to constrain movement of detent member(984) to a partial orbital path about proximal anvil pin (970), and toguide detent member (984) along such a path during rotation of anvilhalf (914) relative to cartridge half (912) about proximal anvil pin(970) between open and clamped states.

As shown, groove (982) and detent member (984) are sized relative toeach other (e.g., in the lateral direction) to permit selectiveoverriding of the interaction between detent member (984) and theperipheral edges of groove (982) upon application of a thresholdseparating force applied between stapler halves (912, 914) to therebywithdraw detent member (984) from groove (982). Likewise, cartridge sideflanges (922) and detent member (984) are sized relative to each otherto permit selective overriding of any interaction between detent member(984) and the upper surface of cartridge side flanges (922) uponapplication of a threshold approximating force applied between staplerhalves (912, 914) to thereby insert detent member (984) into groove(982) while also positioning proximal anvil pin (970) at the closed endof second notch portion (926 b), as indicated by ninth and tenth arrows(A9, A10), respectively, in FIG. 13.

I. Exemplary Linear Cutter Separation Mechanism with Proximal AnvilDetents and Corresponding Proximal Cartridge Indents

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that allows an increased angular range ofrotation between the stapler halves. FIGS. 14A-14B show anotherexemplary surgical stapler (1010) including a cartridge half (1012) andan anvil half (1014) that are configured in such a manner, and which aresimilar in structure and function to stapler (210) described aboveexcept as otherwise described below.

Cartridge half (1012) includes an elongate cartridge channel (1016)having a proximal frame portion (1018) including a laterally opposedpair of upright side flanges (1022). Anvil half (1014) includes anelongate anvil channel (1060) having a proximal frame portion (1062)including a laterally opposed pair of upright side flanges (1066) thatare configured to be received between cartridge channel side flanges(1022) when anvil half (1014) is coupled with cartridge half (1012).

In the example shown, cartridge half (1012) further includes a laterallyopposed pair of indent members (1082) positioned on side flanges (1022),and anvil half (1014) further includes a pair of proximal pivotprojections in the form of laterally opposed detent members (1084)extending laterally outwardly from side flanges (1066). Indent members(1082) are configured to releasably and pivotably capture detent members(1084) with a friction fit or a snap fit such that indent members (1082)and detent members (1084) may collectively define a pivot axis of anvilhalf (1014) relative to cartridge half (1012). In one example, indentmembers (1082) and/or detent members (1084) may be integrally formedtogether with the respective side flanges (1022, 1066) as a unitarypiece(s). For example, indent members (1082) and/or detent members(1084) may be coined on the respective side flanges (1022, 1066).

As shown, indent member (1082) and detent member (1084) are sizedrelative to each other (e.g., in the lateral direction) to permitselective overriding of the interaction between detent member (1084) andthe peripheral edges of indent member (1082) upon application of athreshold separating force applied between stapler halves (1012, 1014)to thereby withdraw detent member (1084) from indent member (1082).Likewise, cartridge side flanges (1022) and detent member (1084) aresized relative to each other to permit selective overriding of anyinteraction between detent member (1084) and the upper surface ofcartridge side flanges (1022) upon application of a thresholdapproximating force applied between stapler halves (1012, 1014) tothereby insert detent member (1084) into indent member (1082), asindicated by eleventh and twelfth arrows (A11, A12) in FIGS. 14A and14B, respectively.

J. Exemplary Linear Cutter Separation Mechanism with Springbar-TypeProximal Anvil Pin

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism that allows an increased angular range ofrotation between the stapler halves different from that described abovein connection to FIGS. 14A-14B. FIGS. 15A-15B show another exemplarysurgical stapler (1110) including a cartridge half (1112) and an anvilhalf (1114) that are configured in such a manner, and which are similarin structure and function to stapler (210) described above except asotherwise described below.

Cartridge half (1112) includes an elongate cartridge channel (1116)having a proximal frame portion (1118) including a laterally opposedpair of upright side flanges (1122). Anvil half (1114) includes anelongate anvil channel (1160) having a proximal frame portion (1162)including a laterally opposed pair of upright side flanges (1166) thatare configured to be received between cartridge channel side flanges(1122) when anvil half (1114) is coupled with cartridge half (1112).

In the example shown, cartridge half (1112) further includes a laterallyopposed pair of bores (1182) positioned on side flanges (1122) and alaterally opposed pair of support tabs (1183) extending laterallyinwardly from side flanges (1122) and vertically aligned with bores(1182) for selectively supporting anvil half (1114) (e.g., when anvilhalf (1114) is in a clamped state). Anvil half (1114) further includes aproximal pivot projection in the form of a springbar (1184) including alaterally opposed pair of pins (1184 a) biased laterally outwardly froma cylindrical tube (1184 b) by a resilient member in the form of acompression spring (1184 c). Pins (1184 a) are further biased laterallyoutwardly from side flanges (1166) to be releasably and pivotablycaptured by bores (1182), thereby coupling the proximal ends of staplerhalves (1112, 1114).

As shown, bores (1182) and springbar (1184) are sized relative to eachother (e.g., in the lateral direction) to permit selective overriding ofthe interaction between pins (1184 a) and the peripheral edges of bores(1182) upon application of a threshold laterally-inward force applied topins (1184 a) and/or upon application of a threshold separating (e.g.,pulling or prying) force applied between stapler halves (1112, 1114) tothereby withdraw pins (1184 a) from bores (1182), as indicated bythirteenth and fourteenth arrows (A13, A14) in FIG. 15B. In one example,upper surfaces of cartridge side flanges (1122) may include cammingsurfaces configured to interact with pins (1184 a) to urge pins (1184 a)laterally inwardly during coupling of stapler halves (1112, 1114), asindicated by fifteenth and sixteenth arrows (A15, A16) in FIGS. 15A and15B, respectively.

In one example, anvil half (1114) may also include an anvil channel stoptab (not shown) projecting proximally from a proximal end of anvilchannel (1160) and having a T-like shape defining a lateral width thatincreases proximally for engaging and pivoting relative to cartridgeside flanges (1122) in a lever-fulcrum arrangement to assist inovercoming the laterally-outward biasing of pins (1184 a) in response torotation of anvil half (1114) away from cartridge half (1112) to apredetermined maximum orientation for decoupling of stapler halves(1112, 1114). Such an anvil channel stop tab may be configured inaccordance with the teachings of U.S. patent application Ser. No.16/165,587, incorporated by reference above.

K. Exemplary Linear Cutter Separation Mechanism with Tab on Anvil Shroudand Corresponding Aperture on Cartridge Half

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism with a portion thereof positioned on theanvil shroud. FIG. 16 shows another exemplary surgical stapler (1210)including a cartridge half (1212) and an anvil half (1214) that areconfigured in such a manner, and which are similar in structure andfunction to stapler (210) described above except as otherwise describedbelow.

Cartridge half (1212) includes an elongate cartridge channel (1216)having a proximal frame portion (1218) including a laterally opposedpair of upright side flanges (1222), each including a notch (1226)arranged at a proximal end thereof. Anvil half (1214) includes anelongate anvil channel having a proximal frame portion including alaterally opposed pair of upright side flanges (not shown) that areconfigured to be received between cartridge channel side flanges (1222)when anvil half (1214) is coupled with cartridge half (1212). A proximalpivot projection in the form of a round (e.g., circular) proximal pin(1270) extends laterally through the proximal ends of the anvil channelside flanges. Additionally, an anvil shroud (1278) is affixed to andcovers an outwardly facing side of the anvil channel.

In the example shown, cartridge half (1212) further includes at leastone window frame (1280) defining an aperture (1282) and extendingdistally from a proximal portion of side flange (1222). Anvil half(1214) further includes at least one detent member (1284) configured toselectively engage window frame (1280) for facilitating releasablecoupling of stapler halves (1212, 1214). Detent member (1284) of thepresent example is positioned on and extends laterally outwardly from atab (1285) extending downwardly from anvil shroud (1278) such thatdetent member (284) is capable of extending laterally into aperture(1282). In one example, detent member (1284) and tab (1285) may beintegrally formed together with anvil shroud (1278) as a unitary piece.Alternatively, detent member (1284) and tab (1285) may be separatelyformed apart from anvil shroud (1278) and coupled thereto, such as viawelding or snapping.

As shown, aperture (1282) and detent member (1284) are sized relative toeach other (e.g., in the lateral direction) to permit selectiveoverriding of the interaction between detent member (1284) and the upperperipheral edge of aperture (1282) upon application of a thresholdlaterally-inward force applied to detent member (1284) and/or uponapplication of a threshold separating (e.g., pulling or prying) forceapplied between stapler halves (1212, 1214) to thereby withdraw detentmember (1284) from aperture (1282). Likewise, window frame (1280) anddetent member (1284) are sized relative to each other to permitselective overriding of any interaction between detent member (1284) andan upper surface of window frame (1280) upon application of a thresholdapproximating force applied between stapler halves (1212, 1214) tothereby insert detent member (1284) into aperture (1282) and couplestapler halves (1212, 1214) to each other. In one example, detent member(1284) may include upper and/or lower camming surfaces configured tointeract with the upper peripheral edge of aperture (1282) and/or theupper surface of window frame (1280) to urge detent member (1284)laterally inwardly during coupling and/or separation of stapler halves(1212, 1214), as indicated by seventeenth arrow (A17) in FIG. 16.

L. Exemplary Linear Cutter Separation Mechanism with Camming SeparationSurfaces

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism with camming features on the cartridge andanvil shrouds. FIGS. 17A-17B show another exemplary surgical stapler(1310) including a cartridge half (1312) and an anvil half (1314) thatare configured in such a manner, and which are similar in structure andfunction to stapler (210) described above except as otherwise describedbelow.

Cartridge half (1312) includes an elongate cartridge channel (1316)having a proximal frame portion (1318) including a laterally opposedpair of upright side flanges (1322). Additionally, a proximal cartridgeshroud (1323) is affixed to and covers a proximal outwardly facing sideof cartridge channel (1316). Cartridge shroud (1323) includes alaterally opposed pair of upright side flanges (1325) each including anotch (1326). Anvil half (1314) includes an elongate anvil channel(1360) having a proximal frame portion (1362) including a laterallyopposed pair of upright side flanges (1366) that are configured to bereceived between cartridge channel side flanges (1322) when anvil half(1314) is coupled with cartridge half (1312). A proximal pivotprojection in the form of a round (e.g., circular) proximal pin (1370)extends laterally through the proximal ends of anvil channel sideflanges (1366). Additionally, an anvil shroud (1378) is affixed to andcovers an outwardly facing side of anvil channel (1360). Anvil shroud(1378) includes a laterally opposed pair of upright side flanges (1379),and proximal anvil pin (1370) extends laterally through the proximalends of anvil shroud side flanges (1379).

In the example shown, cartridge half (1312) further includes a laterallyopposed pair of arched cam ramps (1381) extending laterally inwardlyfrom side flanges (1325) below closed ends of the respective notches(1326). More particularly, arched cam ramps (1381) each partiallyrevolve about the closed end of the respective notch (1326), and taperor curve laterally inwardly from an origin on side flange (1325)generally vertically aligned with the respective notch (1326) to alaterally inwardmost terminus slightly below and distal to therespective notch (1326). Cartridge half (1312) also includes a laterallyopposed pair of arched shoulders (1383) extending laterally inwardlyfrom side flanges (1325) above closed ends of the respective notches(1326) and intersected by the respective notches (1326). Moreparticularly, arched shoulders (1383) each partially revolve about theclosed end of the respective notch (1326) between proximal and distalends generally horizontally aligned with the closed end of therespective notch (1326).

Also in the example shown, anvil half (1314) further includes alaterally opposed pair of detent members (1384) extending laterallyoutwardly from side flanges (1379) below proximal anvil pin (1370).Anvil half (1314) also includes a laterally opposed pair of archedledges (1385) extending laterally outwardly from side flanges (1379)above proximal anvil pin (1370). More particularly, arched ledges (1385)each partially revolve about proximal anvil pin (1370) between proximaland distal ends generally horizontally aligned with proximal anvil pin(1370).

As best shown in FIG. 17B, arched shoulders (1383) are configured toreleasably and movably confront arched ledges (1385) when proximal anvilpin (1370) is received within proximal notches (1326) with anvil half(1314) oriented relative to cartridge half (1312) about proximal anvilpin (1370) within a predetermined angular range, thereby coupling theproximal ends of stapler halves (1312, 1314). More particularly, archedshoulders (1383) may be configured to constrain movement of archedledges (1385) to a partial orbital path about proximal anvil pin (1370),and to guide arched ledges (1385) along such a path during rotation ofanvil half (1314) relative to cartridge half (1312) about proximal anvilpin (1370) within the predetermined angular range. In this regard,arched cam ramps (1381) may be configured to selectively urge detentmembers (1384) laterally inwardly to at least partially define one ormore limits of the predetermined angular range. For example, detentmembers (1384) may each be configured to ride against the respectivearched cam ramp (1381) between its origin and laterally inwardmostterminus and to be urged laterally inwardly thereby. In this manner, asdetent members (1384) approach the respective laterally inwardmosttermini, arched cam ramps (1381) may be configured to urge detentmembers (1384) sufficiently laterally inwardly to cause arched ledges(1385) to deflect laterally inwardly relative to and disengage archedshoulders (1383) in response to rotation of anvil half (1314) away fromcartridge half (1312) to a predetermined maximum orientation fordecoupling of stapler halves (1312, 1314). In one example, archedshoulders (1383) and arched ledges (1385) may include camming surfacesconfigured to interact with each other to urge arched ledges (1385)laterally inwardly during coupling of stapler halves (1312, 1314), asindicated by eighteenth and nineteenth arrows (A18, A19) in FIGS. 17Aand 17B, respectively.

M. Exemplary Linear Cutter Separation Mechanism with Central Tabs onAnvil and Cartridge Halves

In some instances, it may be desirable to provide a surgical staplerhaving a separation mechanism with portions thereof positioned on thecartridge and anvil shrouds different from that described above inconnection to FIGS. 17A-17B. FIG. 18 shows another exemplary surgicalstapler (1410) including a cartridge half (1412) and an anvil half(1414) that are configured in such a manner, and which are similar instructure and function to stapler (210) described above except asotherwise described below.

Cartridge half (1412) includes an elongate cartridge channel (1416)having a proximal frame portion (1418) including a laterally opposedpair of upright side flanges (1422) each including a notch (1426).Additionally, a proximal cartridge shroud (1423) is affixed to andcovers at least a proximal downwardly facing side of cartridge channel(1416). Cartridge shroud (1423) includes a generally laterally centeredupright flange (1425). Anvil half (1414) includes an elongate anvilchannel (1460) having a proximal frame portion (1462) including alaterally opposed pair of upright side flanges (1466) that areconfigured to be received between cartridge channel side flanges (1422)when anvil half (1414) is coupled with cartridge half (1412). A proximalpivot projection in the form of a round (e.g., circular) proximal pin(1470) extends laterally through the proximal ends of anvil channel sideflanges (1466). Additionally, an anvil shroud (1478) is affixed to andcovers at least an upwardly facing side of anvil channel (1460). Anvilshroud (1478) includes a generally laterally centered upright flange(1479).

In the example shown, cartridge half (1412) further includes a shoulder(1483) extending laterally (e.g., leftward) from flange (1425), andanvil half (1414) further includes a ledge (1485) extending laterally(e.g., rightward) from flange (1479). Shoulder (1483) may be configuredto releasably and movably confront ledge (1485) when proximal anvil pin(1470) is received within proximal notches (1426) with anvil half (1414)oriented relative to cartridge half (1412) about proximal anvil pin(1470) within a predetermined angular range, thereby coupling theproximal ends of stapler halves (1412, 1414). In one example, shoulder(1483) and/or ledge (1485) may be angled and/or arched in a manner(s)similar to that described above in connection to FIGS. 17A-17B. In oneexample, shoulder (1483) and ledge (1485) may include camming surfacesconfigured to interact with each other to urge ledge (1485) laterallyoutwardly during coupling of stapler halves (1412, 1414), as indicatedby twentieth arrow (A20) in FIG. 18.

III. Exemplary Combinations

The following examples relate to various non-exhaustive ways in whichthe teachings herein may be combined or applied. It should be understoodthat the following examples are not intended to restrict the coverage ofany claims that may be presented at any time in this application or insubsequent filings of this application. No disclaimer is intended. Thefollowing examples are being provided for nothing more than merelyillustrative purposes. It is contemplated that the various teachingsherein may be arranged and applied in numerous other ways. It is alsocontemplated that some variations may omit certain features referred toin the below examples. Therefore, none of the aspects or featuresreferred to below should be deemed critical unless otherwise explicitlyindicated as such at a later date by the inventors or by a successor ininterest to the inventors. If any claims are presented in thisapplication or in subsequent filings related to this application thatinclude additional features beyond those referred to below, thoseadditional features shall not be presumed to have been added for anyreason relating to patentability.

Example 1

A surgical stapler comprising: (a) a first half comprising: (i) a firstelongate member, and (ii) a surface having a plurality of staple formingpockets; (b) a second half configured to releasably couple with thefirst half, wherein the second half comprises: (i) a second elongatemember having a distal portion operable to deploy staples toward thefirst half, wherein the first and second elongate members are configuredto be pivotable relative to each other about a pivot axis when the firsthalf and the second half are releasably coupled together; (c) a latchingmember operable to selectively clamp the first half against the secondhalf to thereby define a clamped state of the surgical stapler; (d) adetent member extending laterally relative to a longitudinal axis of thesurgical stapler from one of the first half or the second half towardthe other of the first half or the second half, and (e) a shouldermember positioned on the other of the first half or the second half,wherein the shoulder member is configured to selectively engage thedetent member in response to rotation of the first elongate member awayfrom the second elongate member about the pivot axis to an open state inwhich the first and second elongate members assume a predeterminedmaximum angular orientation relative to one another and remainreleasably coupled together at their proximal ends.

Example 2

The surgical stapler of Example 1, wherein the shoulder member isdefined by a peripheral edge of an aperture positioned on the other ofthe first half or the second half.

Example 3

The surgical stapler of Example 2, wherein the aperture is configured tocapture the detent member such that the detent member is movable withinthe aperture when the first elongate member is angularly orientedrelative to the second elongate member about the pivot axis within apredetermined angular range, wherein a first end of the predeterminedangular range corresponds to the clamped state and a second end of thepredetermined angular range is defined by the predetermined maximumangular orientation.

Example 4

The surgical stapler of any of the preceding Examples, wherein thedetent member extends laterally outwardly from the first half, whereinthe shoulder member is positioned on the second half.

Example 5

The surgical stapler of Example 4, wherein the detent member extendslaterally outwardly from the first elongate member.

Example 6

The surgical stapler of Example 5, wherein the detent member isintegrally formed with the first elongate member as a unitary piece.

Example 7

The surgical stapler of any one or more of Examples 1 through 3, whereinthe detent member extends laterally inwardly from the second half,wherein the shoulder member is positioned on the first half.

Example 8

The surgical stapler of any of the preceding Examples, wherein thedetent member is positioned distally relative to the pivot axis.

Example 9

The surgical stapler of any of the preceding Examples, wherein theshoulder member is positioned distally relative to the pivot axis.

Example 10

The surgical stapler of any of the preceding Examples, wherein thedetent member includes a laterally opposed pair of detent members,wherein the shoulder member includes a laterally opposed pair ofshoulder members.

Example 11

The surgical stapler of any of the preceding Examples, wherein thedetent member and the shoulder member are laterally sized relative toeach other to permit selective disengagement of the detent member fromthe shoulder member in response to application of a threshold forceapplied between the first half and the second half to thereby allowselective coupling and separating of the first half and the second half.

Example 12

The surgical stapler of Example 11, wherein the detent member and theshoulder member are laterally sized relative to each other to permitselective disengagement of the detent member from the shoulder member inresponse to application of a threshold rotational force applied betweenthe first half and the second half about the pivot axis.

Example 13

The surgical stapler of any one or more of Examples 11 through 12,wherein the detent member and the shoulder member are laterally sizedrelative to each other to permit selective disengagement of the detentmember from the shoulder member in response to application of athreshold linear force applied between the first half and the secondhalf while the first half and the second half are parallel with eachother.

Example 14

The surgical stapler of any of the preceding Examples, wherein the pivotaxis is defined by a pin.

Example 15

The surgical stapler of any of the preceding Examples, wherein thedistal portion of the second elongate member is configured to receive astaple cartridge.

Example 16

A surgical stapler comprising: (a) a first half comprising: (i) a firstelongate member, (ii) a surface having a plurality of staple formingpockets, (iii) a distal latch projection, and (iv) a proximal pivotprojection; (b) a second half configured to releasably couple with thefirst half, wherein the second half comprises: (i) a second elongatemember having a distal portion operable to deploy staples toward thefirst half and at least one proximal notch configured to pivotablyreceive the proximal pivot projection of the first half, and (ii) alatching lever pivotably coupled to the second elongate member andconfigured to selectively engage the distal latch projection forclamping the first half against the second half to thereby define aclamped state of the surgical stapler; (c) a detent member extendinglaterally from one of the first half or the second half toward the otherof the first half or the second half, and (d) an aperture positioned onthe other of the first half or the second half and configured to capturethe detent member such that the detent member is movable within theaperture when the first half is angularly oriented relative to thesecond half about the proximal pivot projection within a predeterminedangular range, wherein a first end of the predetermined angular rangecorresponds to an open state in which the first and second elongatemembers assume a predetermined maximum angular orientation relative toone another and remain releasably coupled together at their proximalends.

Example 17

The surgical stapler of Example 16, wherein the detent member extendslaterally outwardly from the first half, wherein the aperture ispositioned on the second half.

Example 18

The surgical stapler of Example 17, wherein the aperture includes anupper peripheral edge configured to selectively engage the detent memberin response to rotation of the first half relative to the second halfabout the proximal pivot projection to the second end of thepredetermined angular range to thereby define the open state of thesurgical stapler.

Example 19

The surgical stapler of Example 18, wherein the detent member and theupper peripheral edge of the aperture are laterally sized relative toeach other to permit selective disengagement of the detent member fromthe upper peripheral edge of the aperture in response to application ofa threshold force applied between the first half and the second half tothereby allow selective separating of the first half and the secondhalf.

Example 20

A surgical stapler comprising: (a) a first half comprising: (i) a firstelongate member, (ii) a surface having a plurality of staple formingpockets, (iii) a distal latch projection, (iv) a proximal pivotprojection, and (v) a detent member extending laterally outwardly fromthe first elongate member; and (b) a second half configured toreleasably couple with the first half, wherein the second halfcomprises: (i) a second elongate member having a distal portion operableto deploy staples toward the first half and at least one proximal notchconfigured to pivotably receive the proximal pivot projection of thefirst half, (ii) a latching lever pivotably coupled to the secondelongate member and configured to selectively engage the distal latchprojection for clamping the first half against the second half tothereby define a clamped state of the surgical stapler, and (iii) ashoulder member configured to selectively engage the detent member inresponse to rotation of the first half away from the second half aboutthe proximal pivot projection to an open state in which the first andsecond elongate members assume a predetermined maximum angularorientation relative to one another and remain releasably coupledtogether at their proximal ends.

IV. Miscellaneous

It should be understood that any one or more of the teachings,expressions, embodiments, examples, etc. described herein may becombined with any one or more of the other teachings, expressions,embodiments, examples, etc. that are described herein. Theabove-described teachings, expressions, embodiments, examples, etc.should therefore not be viewed in isolation relative to each other.Various suitable ways in which the teachings herein may be combined willbe readily apparent to those of ordinary skill in the art in view of theteachings herein. Such modifications and variations are intended to beincluded within the scope of the claims.

Further, any one or more of the teachings, expressions, embodiments,examples, etc. described herein may be combined with any one or more ofthe teachings, expressions, embodiments, examples, etc. described inU.S. Pat. No. 10,631,866, entitled “Release Mechanism for LinearSurgical Stapler,” issued on Apr. 28, 2020; U.S. Pub. No. 2019/0239882,entitled “Lockout Assembly for Linear Surgical Stapler,” published onAug. 8, 2019; U.S. Pub. No. 2019/0239886, entitled “Features to Alignand Close Linear Surgical Stapler”, published on Aug. 8, 2019; U.S. Pub.No. 2019/0239883, entitled “Releasable Coupling Features for ProximalPortions of Linear Surgical Stapler,” published on Aug. 8, 2019; U.S.Pub. No. 2019/0239884, entitled “Firing Lever Assembly for LinearSurgical Stapler,” published on Aug. 8, 2019; U.S. Pub. No.2019/0239885, entitled “Clamping Mechanism for Linear Surgical Stapler,”published on Aug. 8, 2019; U.S. Pub. No. 2020/0046350, entitled “FiringSystem for Linear Surgical Stapler,” published on Feb. 13, 2020; U.S.Pub. No. 2020/0046353, entitled “Clamping Assembly for Linear SurgicalStapler,” published on Feb. 13, 2020; U.S. Pub. No. 2020/0113561,entitled “Anvil Assembly for Linear Surgical Stapler,” published on Apr.16, 2020; U.S. Pub. No. 2020/0113562, entitled “Closure Assembly forLinear Surgical Stapler,” published on Apr. 16, 2020; and/or U.S. Pub.No. 2020/0046351, entitled “Decoupling Mechanism for Linear SurgicalStapler,” published on Feb. 13, 2020. The disclosure of each of theseapplications is incorporated by reference herein.

Further, any one or more of the teachings, expressions, embodiments,examples, etc. described herein may be combined with any one or more ofthe teachings, expressions, embodiments, examples, etc. described inU.S. App. No. [Atty. Ref. END9258USNP1], entitled “Pin Trap Mechanismfor Surgical Linear Cutter,” filed on even date herewith; and/or U.S.App. No. [Atty. Ref. END9265USNP1], entitled “Separation Mechanism forSurgical Linear Cutter,” filed on even date herewith. The disclosure ofeach of these applications is incorporated by reference herein.

It should be appreciated that any patent, publication, or otherdisclosure material, in whole or in part, that is said to beincorporated by reference herein is incorporated herein only to theextent that the incorporated material does not conflict with existingdefinitions, statements, or other disclosure material set forth in thisdisclosure. As such, and to the extent necessary, the disclosure asexplicitly set forth herein supersedes any conflicting materialincorporated herein by reference. Any material, or portion thereof, thatis said to be incorporated by reference herein, but which conflicts withexisting definitions, statements, or other disclosure material set forthherein will only be incorporated to the extent that no conflict arisesbetween that incorporated material and the existing disclosure material.

Versions of the devices described above may have application inconventional medical treatments and procedures conducted by a medicalprofessional, as well as application in robotic-assisted medicaltreatments and procedures. By way of example only, various teachingsherein may be readily incorporated into a robotic surgical system suchas the DAVINCI™ system by Intuitive Surgical, Inc., of Sunnyvale, Calif.

Versions of the devices described above may be designed to be disposedof after a single use, or they can be designed to be used multipletimes. Versions may, in either or both cases, be reconditioned for reuseafter at least one use. Reconditioning may include any combination ofthe steps of disassembly of the device, followed by cleaning orreplacement of particular pieces, and subsequent reassembly. Inparticular, some versions of the device may be disassembled, and anynumber of the particular pieces or parts of the device may beselectively replaced or removed in any combination. Upon cleaning and/orreplacement of particular parts, some versions of the device may bereassembled for subsequent use either at a reconditioning facility, orby a user immediately prior to a procedure. Those skilled in the artwill appreciate that reconditioning of a device may utilize a variety oftechniques for disassembly, cleaning/replacement, and reassembly. Use ofsuch techniques, and the resulting reconditioned device, are all withinthe scope of the present application.

By way of example only, versions described herein may be sterilizedbefore and/or after a procedure. In one sterilization technique, thedevice is placed in a closed and sealed container, such as a plastic orTYVEK bag. The container and device may then be placed in a field ofradiation that can penetrate the container, such as gamma radiation,x-rays, or high-energy electrons. The radiation may kill bacteria on thedevice and in the container. The sterilized device may then be stored inthe sterile container for later use. A device may also be sterilizedusing any other technique known in the art, including but not limited tobeta or gamma radiation, ethylene oxide, or steam.

Having shown and described various embodiments of the present invention,further adaptations of the methods and systems described herein may beaccomplished by appropriate modifications by one of ordinary skill inthe art without departing from the scope of the present invention.Several of such potential modifications have been mentioned, and otherswill be apparent to those skilled in the art. For instance, theexamples, embodiments, geometrics, materials, dimensions, ratios, steps,and the like discussed above are illustrative and are not required.Accordingly, the scope of the present invention should be considered interms of the following claims and is understood not to be limited to thedetails of structure and operation shown and described in thespecification and drawings.

I/We claim:
 1. A surgical stapler comprising: (a) a first halfcomprising: (i) a first elongate member, and (ii) a surface having aplurality of staple forming pockets; (b) a second half configured toreleasably couple with the first half, wherein the second halfcomprises: (i) a second elongate member having a distal portion operableto deploy staples toward the first half, wherein the first and secondelongate members are configured to be pivotable relative to each otherabout a pivot axis when the first half and the second half arereleasably coupled together; (c) a latching member operable toselectively clamp the first half against the second half to therebydefine a clamped state of the surgical stapler; (d) a detent memberextending laterally relative to a longitudinal axis of the surgicalstapler from one of the first half or the second half toward the otherof the first half or the second half, and (e) a shoulder memberpositioned on the other of the first half or the second half, whereinthe shoulder member is configured to selectively engage the detentmember in response to rotation of the first elongate member away fromthe second elongate member about the pivot axis to an open state inwhich the first and second elongate members assume a predeterminedmaximum angular orientation relative to one another and remainreleasably coupled together at their proximal ends.
 2. The surgicalstapler of claim 1, wherein the shoulder member is defined by aperipheral edge of an aperture positioned on the other of the first halfor the second half.
 3. The surgical stapler of claim 2, wherein theaperture is configured to capture the detent member such that the detentmember is movable within the aperture when the first elongate member isangularly oriented relative to the second elongate member about thepivot axis within a predetermined angular range, wherein a first end ofthe predetermined angular range corresponds to the clamped state and asecond end of the predetermined angular range is defined by thepredetermined maximum angular orientation.
 4. The surgical stapler ofclaim 1, wherein the detent member extends laterally outwardly from thefirst half, wherein the shoulder member is positioned on the secondhalf.
 5. The surgical stapler of claim 4, wherein the detent memberextends laterally outwardly from the first elongate member.
 6. Thesurgical stapler of claim 5, wherein the detent member is integrallyformed with the first elongate member as a unitary piece.
 7. Thesurgical stapler of claim 1, wherein the detent member extends laterallyinwardly from the second half, wherein the shoulder member is positionedon the first half.
 8. The surgical stapler of claim 1, wherein thedetent member is positioned distally relative to the pivot axis.
 9. Thesurgical stapler of claim 1, wherein the shoulder member is positioneddistally relative to the pivot axis.
 10. The surgical stapler of claim1, wherein the detent member includes a laterally opposed pair of detentmembers, wherein the shoulder member includes a laterally opposed pairof shoulder members.
 11. The surgical stapler of claim 1, wherein thedetent member and the shoulder member are laterally sized relative toeach other to permit selective disengagement of the detent member fromthe shoulder member in response to application of a threshold forceapplied between the first half and the second half to thereby allowselective coupling and separating of the first half and the second half.12. The surgical stapler of claim 11, wherein the detent member and theshoulder member are laterally sized relative to each other to permitselective disengagement of the detent member from the shoulder member inresponse to application of a threshold rotational force applied betweenthe first half and the second half about the pivot axis.
 13. Thesurgical stapler of claim 11, wherein the detent member and the shouldermember are laterally sized relative to each other to permit selectivedisengagement of the detent member from the shoulder member in responseto application of a threshold linear force applied between the firsthalf and the second half while the first half and the second half areparallel with each other.
 14. The surgical stapler of claim 1, whereinthe pivot axis is defined by a pin.
 15. The surgical stapler of claim 1,wherein the distal portion of the second elongate member is configuredto receive a staple cartridge.
 16. A surgical stapler comprising: (a) afirst half comprising: (i) a first elongate member, (ii) a surfacehaving a plurality of staple forming pockets, (iii) a distal latchprojection, and (iv) a proximal pivot projection; (b) a second halfconfigured to releasably couple with the first half, wherein the secondhalf comprises: (i) a second elongate member having a distal portionoperable to deploy staples toward the first half and at least oneproximal notch configured to pivotably receive the proximal pivotprojection of the first half, and (ii) a latching lever pivotablycoupled to the second elongate member and configured to selectivelyengage the distal latch projection for clamping the first half againstthe second half to thereby define a clamped state of the surgicalstapler; (c) a detent member extending laterally from one of the firsthalf or the second half toward the other of the first half or the secondhalf, and (d) an aperture positioned on the other of the first half orthe second half and configured to capture the detent member such thatthe detent member is movable within the aperture when the first half isangularly oriented relative to the second half about the proximal pivotprojection within a predetermined angular range, wherein a first end ofthe predetermined angular range corresponds to the clamped state and asecond end of the predetermined angular range corresponds to an openstate in which the first and second elongate members assume apredetermined maximum angular orientation relative to one another andremain releasably coupled together at their proximal ends.
 17. Thesurgical stapler of claim 16, wherein the detent member extendslaterally outwardly from the first half, wherein the aperture ispositioned on the second half.
 18. The surgical stapler of claim 17,wherein the aperture includes an upper peripheral edge configured toselectively engage the detent member in response to rotation of thefirst half relative to the second half about the proximal pivotprojection to the second end of the predetermined angular range tothereby define the open state of the surgical stapler.
 19. The surgicalstapler of claim 18, wherein the detent member and the upper peripheraledge of the aperture are laterally sized relative to each other topermit selective disengagement of the detent member from the upperperipheral edge of the aperture in response to application of athreshold force applied between the first half and the second half tothereby allow selective separating of the first half and the secondhalf.
 20. A surgical stapler comprising: (a) a first half comprising:(i) a first elongate member, (ii) a surface having a plurality of stapleforming pockets, (iii) a distal latch projection, (iv) a proximal pivotprojection, and (v) a detent member extending laterally outwardly fromthe first elongate member; and (b) a second half configured toreleasably couple with the first half, wherein the second halfcomprises: (i) a second elongate member having a distal portion operableto deploy staples toward the first half and at least one proximal notchconfigured to pivotably receive the proximal pivot projection of thefirst half, (ii) a latching lever pivotably coupled to the secondelongate member and configured to selectively engage the distal latchprojection for clamping the first half against the second half tothereby define a clamped state of the surgical stapler, and (iii) ashoulder member configured to selectively engage the detent member inresponse to rotation of the first half away from the second half aboutthe proximal pivot projection to an open state in which the first andsecond elongate members assume a predetermined maximum angularorientation relative to one another and remain releasably coupledtogether at their proximal ends.